A specific group of genes have been discovered by geneticists while analyzing the dog's genome. These specific genes are responsible for the coat color, variations in size, as well as some congenital diseases.
In the future they would like to have you be able to create your perfect dog by choosing their color and maybe even their temperament.
MY TAKE: I hope the AKC doesn't allow this to happen, why can't we just keep things the way they are? I think mutts are some of the best dogs out there.